Executive summary: The Western and Central Pacific ocean is now the source of more than half the world’s tuna catch. Having fished tuna stocks in other oceans to the point of serious decline or even collapse, countries are increasingly sending their fishing fleets to the Pacific to exploit the region’s stocks. Unless urgent steps are taken, Pacific tuna stocks will be the next casualties of rampant global overfishing. The expedition team documented that a ban on fish aggregating devices (FADs) is inadequate to reduce overfishing of tuna.